[TenTec] Hi power Ten Tec ant tuner swr drift?

[Phil Chambley, Sr.]

The change in meter readings is most likely due to excessive current flowing
through the fixed capacitors, which is causing their capacitance to change.
Same is true of ferrite material, and ferrite won't generally recover with
cooling.

73
Phil K4DPK
----- Original Message ----- 
From: "denton" <denton at oregontrail.net>
To: <tentec at contesting.com>
Sent: Sunday, November 14, 2004 2:22 PM
Subject: Re: [TenTec] Hi power Ten Tec ant tuner swr drift?


> What I was originally trying to determine is why the older tuner would
have
> swr drift while the new one didn't.
> I feed the base of the verticle with a 2:1 balun running in reverse...then
> to 450 ohm twin lead to a 1:1 remote balun on the otherside of the wall of
> the hamshack. titanex has a 32 ft verticle they feed the same way...
> I don't really intend to use the 22 ft verticle to xmit on 80 meters...I
> have an 80 meter drouping doublet I use for that purpose...
> I do intend to use the verticle on 40 thru 10 meters. It is currently has
an
> elevated feedpoint of 18 feet with 4 22' radials. With the whole system
> elevated, I am trying to avoid running the verticle ground mounted, thus
not
> have to bury some 30 to 50 radials and the inherent ground losses.
> I have used this particular antenna as a 16 ft verticle with 16 ft radials
> to some degree of success on 20 thru 10 meters.
> ----- Original Message ----- 
> From: "Steve N4LQ" <n4lq at iglou.com>
> To: <tentec at contesting.com>
> Sent: Sunday, November 14, 2004 11:02 AM
> Subject: Re: [TenTec] Hi power Ten Tec ant tuner swr drift?
>
>
> > Mike.
> > I started to reply with a barage of antenna information and caught
myself
> > before I went off the deep end. Just let me conclude that:
> > 1. That vertical is not balanced so forget about baluns. (Your feedline
> > doesn't make the antenna balanced!)
> >
> > 2. It's too short for anything below 30 meters. (electrically)
> >
> > 3. You will burn up your tuner if you persist.
> > 4. You are wasting huge amounts of RF in that system.
> > Suggestion:
> > Use whatever is holding up that vertical to support an inverted vee
which
> > is at least 100ft long and feed it with your 450 ohm line and tuner.
> > Or.  If you must have a short vertical, go buy one.
> >
> >
> > Steve N4LQ
> > ----- Original Message ----- 
> > From: "denton" <denton at oregontrail.net>
> > To: <tentec at contesting.com>
> > Sent: Sunday, November 14, 2004 1:23 PM
> > Subject: Re: [TenTec] Hi power Ten Tec ant tuner swr drift?
> >
> >
> >> Got a couple of nice replies right off the bat...should of added more
> >> specifics..
> >> I am running barefoot at 100 watts..no amp in the place
> >> I am not using the internal balun but was using a 4:1 current balun I
> >> homebrewed as a remote balun...with 3 feet of rg-213 coax. I have
> >> determined that the 4:1 current balun was not accepting power on 80
> >> meters and have replaced it with a homebrew 1:1 balun that I have
> >> verified as being good via an antenna analyzer.
> >> I will replace the internal balun with something a lot more stouter...
> >> ----- Original Message ----- 
> >> From: "Michael Tope" <W4EF at dellroy.com>
> >> To: <tentec at contesting.com>
> >> Sent: Sunday, November 14, 2004 9:45 AM
> >> Subject: Re: [TenTec] Hi power Ten Tec ant tuner swr drift?
> >>
> >>
> >>> Are you using the ferrite balun? If so, check its temperature too.
> >>> The stock balun in the this tuner is very unforgiving. When I built
> >>> this tuner back in 1985, I smoked the balun almost immediately
> >>> when I started using an amplifier with it.
> >>>
> >>> Mike, W4EF....................
> >>>
> >>> ----- Original Message -----
> >>> From: "denton" <denton at oregontrail.net>
> >>> To: "Tentec Reflector" <tentec at contesting.com>
> >>> Sent: Sunday, November 14, 2004 8:43 AM
> >>> Subject: [TenTec] Hi power Ten Tec ant tuner swr drift?
> >>>
> >>>
> >>>> Hi all...
> >>>> I have recently purchased an old Ten Tec L network ant tuner..the one
> >>>> that
> >>> was in kit form many years ago.
> >>>> I have noticed that when feeding it to a 22 ft elevated ground plane
on
> >>>> 80
> >>> meters (yeah I know, really a mismatch) via 450 ohm twin lead that the
> >>> swr
> >>> will drift on 80 meters and the 2 kv ceramic caps on the cap switch
will
> >>> get
> >>> really hot...
> >>>> Will switching the caps to transmitting micas alliviate the problem??
> >>>> Bad switch??
> >>>> 80 meters on this particular antenna apparently is the only band this
> >>> occurs with this transmatch...my 238A does not exhibit this little
> >>> problem
> >>> when feeding the same antenna.
> >>>
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> TenTec mailing list
> >>> TenTec at contesting.com
> >>> http://lists.contesting.com/mailman/listinfo/tentec
> >>>
> >>>
> >>
> >>
> >> _______________________________________________
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> >>
> >
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> >
>
>
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